Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-12-21
Nucl.Phys.B557:60-78,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
revised after referee report, new figure 5, some typos corrected, accepted for publication in Nucl.Phys.B
Scientific paper
10.1016/S0550-3213(99)00368-5
We reanalyze the contributions to neutrinoless double beta ($\znbb$) decay from supersymmetry with explicit breaking of R-parity. Although we keep both bilinear and trilinear terms, our emphasis is put on bilinear R-parity breaking terms, because these mimic more closely the models where the breaking of R-parity is spontaneous. Comparing the relevant Feynman diagrams we conclude that the usual mass mechanism of double beta decay is the dominant one. From the non-observation of $\znbb$ decay we set limits on the bilinear R-parity breaking parameters of typically a (few) 100 $keV$. Despite such stringent bounds, we stress that the magnitude of R-parity violating phenomena that can be expected at accelerator experiments can be very large, since they involve mainly the third generation, while $\znbb$ decay constrains only the first generation couplings.
Hirsch Manfred
Valle Jose W. F.
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